attach_group_policy · Awslabs Valkey MCP: Risk & Policy

WHAT IT DOES

What attach_group_policy does on Awslabs Valkey

AI agents use attach_group_policy to create or update resources in Awslabs Valkey — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Awslabs Valkey environment.

WHY IT NEEDS A POLICY

Why attach_group_policy needs a policy

The tool attaches a policy to a group, which creates or modifies IAM permissions. This is a reversible Write operation (policies can be detached). It is not Destructive because it does not permanently delete or overwrite data. The severity is high because misconfiguring group policies could grant excessive permissions to multiple users, creating a significant security blast radius.

From the tool's definition Tool name is 'attach_group_policy' which performs a policy attachment operation. The sibling tools on this server include policy management operations like 'add_inline_policy' and 'add_user_to_group', indicating this server handles AWS IAM and access control…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

attach_group_policy Rate-limited

attach_group_policy stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "attach_group_policy": {
      "limits": [
        {
          "counter": "attach_group_policy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Awslabs Valkey, so you can run agents against it safely.

FAQ

Questions about attach_group_policy

What does the attach_group_policy tool do? +

attach_group_policy. It is categorised as a Write tool in the Awslabs Valkey MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on attach_group_policy? +

Register the Awslabs Valkey MCP server in PolicyLayer and add a rule for attach_group_policy: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Awslabs Valkey. Nothing to install.

What risk level is attach_group_policy? +

attach_group_policy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit attach_group_policy? +

Yes. Add a rate_limit block to the attach_group_policy rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block attach_group_policy completely? +

Set action: deny in the PolicyLayer policy for attach_group_policy. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides attach_group_policy? +

attach_group_policy is provided by the Awslabs Valkey MCP server (awslabs.valkey-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.